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OKLAHOMA PANHANDLE CORN
ERFORMANCE TRIALS, 2008
PRODUCTION TECHNOLOGY CROPS
AHOMA COOPERATIVE EXTENSION SERVICE
DEPARTMENT OF PLANT AND SOIL SCIENCES
DIVISION OF AGRICULTURAL SCIENCES & NATURAL RESOURCES
OKLAHOMA STATE UNIVERSITY
PT 2008-5 November 2008 Vol. 20, No. 5
Rick Kochenower Britt Hicks
Area Research and Extension Specialist Area Extension Livestock Specialist
Plant and Soil Sciences Department Northwest District
TRIAL OBJECTIVES AND PROCEDURES
Each year the Oklahoma Cooperative Extension Service conducts corn performance trials in the Oklahoma panhandle. These trials provide producers, extension educators, industry representatives, and researchers with information on corn hybrids marketed in Oklahoma. Company participation was voluntary, so some hybrids marketed in Oklahoma were not included in the test. Company or brand name, entry designation, plant characteristics, and maturity information, were provided by the companies and were not validated by OSU; therefore, we strongly recommend consulting company representatives for more detailed information regarding these traits and disease resistance ratings (Tables 3 and 4).
Irrigated test plots were established at the Oklahoma Panhandle Research and Extension Center (OPREC) near Goodwell and the Joe Webb farm near Guymon. Fertility levels, herbicide use, and soil series (when available) are listed with data. Individual plots were two 25-foot rows seeded at a target population of 32,000 plants/ac. Plots were trimmed to 20 feet prior to being harvested to determine grain yield. The ensilage trial was seeded the same as grain trial with 10 feet of one row harvested to determine yield. Experimental design for all locations was a randomized complete block with four replications. Grain yield is reported consistent with U.S. No. 1 grade corn (56 lbs/bu and adjusted to moisture content of 15.5%). Corn ensilage was harvested at the early dent stage with average moisture content of 69 % and production is reported as tons/ac adjusted to 65% moisture.
GROWING CONDITIONS
In 2008 soil moisture for planting corn in the panhandle region was supplied by pre-irrigation due to lack of rainfall in the previous 10 months. Rainfall from July 1 2007 through April 30 2008 was 40% of average (4.71 inches compared to 11.78 inches). Also 40% or the 4.71 inches fell in July of 2007; therefore, stored soil moisture from rainfall was minimal. Rainfall continued to be below the long term average until significant rainfall was received in July (Table 1). The OPREC soil temperature of 55 ° F on April 1 at the two-inch depth was lower than observations in previous years. The pollination period for most corn (July 1 through July 15 was) nearly ideal with temperatures below the long term average for 11 of the 15 days (Fig 1). Also the temperatures remain near average for most of the month, with the only 100 ° F recorded the 31st of July 2008. Lower than average temperatures (high temperatures from Aug 10 to 30th ranged from 65 to 92) and rainfall in August delayed maturity of corn, therefore silage and grain harvest was approximately two weeks later than normal. Grain yields for producers were good with reported yields of 240 bu/ac reported. The yields at the Joe Webb location were as good as any in the last 10 year of trails in the panhandle region.
RESULTS
Grain yield, test weight, harvest moisture, and plant populations for OPREC and Webb trials are presented (Tables 3-5). Ensilage yields are reported in Table 8. Protein, Acid Detergent Fiber (ADF) and Total Digestible Nutrients (TDN), however are not reported, because no significant differences existed among hybrids. Averages were 5.8, 34.1, and 62.3 %, for Protein, ADF and TDN respectively. Similarly, there were no differences among hybrids in energy values for, maintenance, lactation, and gain values with averages of 0.63, 0.64, and 0.37 MCal/lb respectively. Least Significant

OKLAHOMA PANHANDLE CORN
ERFORMANCE TRIALS, 2008
PRODUCTION TECHNOLOGY CROPS
AHOMA COOPERATIVE EXTENSION SERVICE
DEPARTMENT OF PLANT AND SOIL SCIENCES
DIVISION OF AGRICULTURAL SCIENCES & NATURAL RESOURCES
OKLAHOMA STATE UNIVERSITY
PT 2008-5 November 2008 Vol. 20, No. 5
Rick Kochenower Britt Hicks
Area Research and Extension Specialist Area Extension Livestock Specialist
Plant and Soil Sciences Department Northwest District
TRIAL OBJECTIVES AND PROCEDURES
Each year the Oklahoma Cooperative Extension Service conducts corn performance trials in the Oklahoma panhandle. These trials provide producers, extension educators, industry representatives, and researchers with information on corn hybrids marketed in Oklahoma. Company participation was voluntary, so some hybrids marketed in Oklahoma were not included in the test. Company or brand name, entry designation, plant characteristics, and maturity information, were provided by the companies and were not validated by OSU; therefore, we strongly recommend consulting company representatives for more detailed information regarding these traits and disease resistance ratings (Tables 3 and 4).
Irrigated test plots were established at the Oklahoma Panhandle Research and Extension Center (OPREC) near Goodwell and the Joe Webb farm near Guymon. Fertility levels, herbicide use, and soil series (when available) are listed with data. Individual plots were two 25-foot rows seeded at a target population of 32,000 plants/ac. Plots were trimmed to 20 feet prior to being harvested to determine grain yield. The ensilage trial was seeded the same as grain trial with 10 feet of one row harvested to determine yield. Experimental design for all locations was a randomized complete block with four replications. Grain yield is reported consistent with U.S. No. 1 grade corn (56 lbs/bu and adjusted to moisture content of 15.5%). Corn ensilage was harvested at the early dent stage with average moisture content of 69 % and production is reported as tons/ac adjusted to 65% moisture.
GROWING CONDITIONS
In 2008 soil moisture for planting corn in the panhandle region was supplied by pre-irrigation due to lack of rainfall in the previous 10 months. Rainfall from July 1 2007 through April 30 2008 was 40% of average (4.71 inches compared to 11.78 inches). Also 40% or the 4.71 inches fell in July of 2007; therefore, stored soil moisture from rainfall was minimal. Rainfall continued to be below the long term average until significant rainfall was received in July (Table 1). The OPREC soil temperature of 55 ° F on April 1 at the two-inch depth was lower than observations in previous years. The pollination period for most corn (July 1 through July 15 was) nearly ideal with temperatures below the long term average for 11 of the 15 days (Fig 1). Also the temperatures remain near average for most of the month, with the only 100 ° F recorded the 31st of July 2008. Lower than average temperatures (high temperatures from Aug 10 to 30th ranged from 65 to 92) and rainfall in August delayed maturity of corn, therefore silage and grain harvest was approximately two weeks later than normal. Grain yields for producers were good with reported yields of 240 bu/ac reported. The yields at the Joe Webb location were as good as any in the last 10 year of trails in the panhandle region.
RESULTS
Grain yield, test weight, harvest moisture, and plant populations for OPREC and Webb trials are presented (Tables 3-5). Ensilage yields are reported in Table 8. Protein, Acid Detergent Fiber (ADF) and Total Digestible Nutrients (TDN), however are not reported, because no significant differences existed among hybrids. Averages were 5.8, 34.1, and 62.3 %, for Protein, ADF and TDN respectively. Similarly, there were no differences among hybrids in energy values for, maintenance, lactation, and gain values with averages of 0.63, 0.64, and 0.37 MCal/lb respectively. Least Significant